YEREVAN (RFE/RL)-Armenia marked on Tuesday the tenth anniversary of an armed attack on its parliament that left its prime minister, parliament speaker and six other officials dead and had lasting political repercussions for the country.

President Serzh Sargsyan and other top state officials as well as opposition leaders laid flowers at the graves of the late Prime Minister Vazgen SargsyanSargsyan and speaker Karen Demirchian amid lingering questions about some circumstances of the shootings.

On October 27, 1999 Armenia and the outside world watched in horror as television images of five gunmen led by Nairi Hunanian, an obscure former journalist, burst into the National Assembly and sprayed it with bullets with the stated aim of changing what they denounced as a corrupt and undemocratic government. The gunmen, among them Hunanian's brother and uncle, surrendered to police after overnight negotiations with then President Robert Kocharian. All of them were tried and sentenced to life imprisonment in December 2003.

The attack came just five months after Sargsyan's and Demirchian's Miasnutyun (Unity) alliance swept to a landslide victory in parliamentary elections. It thrust the Armenian government into serious turmoil, with government factions loyal to the slain officials suspecting Kocharian and then National Security Minister Serzh Sargsyan of eliminating increasingly powerful rivals.

Kocharian and Serzh Sargsyan prevailed in the power struggle by May 2000. Both he and Sargsyan (no relation to Vazgen) have repeatedly denied any involvement in the shootings, saying that their government foes for moths controlled the criminal inquiry into the attack and never came up with compelling evidence to back up their suspicions.

Hunanian insisted throughout his marathon trial that the decision to seize the National Assembly had been taken by himself without anybody's orders. But many in Armenia believe that he had powerful sponsors outside the parliament building.

The main official ceremony to mark the anniversary took place outside the parliament building in Yerevan where a memorial to the attack victims was unveiled in the presence of their relatives, President Sargsyan, government ministers and parliament deputies. They stood silently as Demirchian's widow Rima accused the authorities of failing to solve the killings in a speech.

"The crime of October 27 is unprecedented in human history with its brutality. It shook the foundations of our statehood. Many things have remained unsolved," she said, adding: "That crime must be solved in full."

The widow of another victim, deputy speaker Yuri Bakhshian, complained that the memorial was placed inside the parliament compound and will therefore not be accessible to the public. "They placed it here because there is a sense of guilt," Anahit Bakhshian, herself a member of parliament from the opposition Zharangutyun party, told RFE/RL.

Demirchian's son Stepan, who was Kocharian's main challenger in the 2003 presidential election, also attended the ceremony. "Ten years on, consequences of that unprecedented and brutal crime have not been overcome," he told RFE/RL at Yerablur military ceremony, where Vazgen Sargsyan was laid to rest. "Nothing was done by the authorities to prevent that crime and, conversely, everything was done to cover up the crime."

"Had it not been for October 27, I'm sure that we would have lived in a totally different country," added Demirchian.

"The best way to respect the memory of Vazgen Sargsyan and Karen Demirchian is not to unveil statues but to solve the October 27 crime," scoffed Aram Sargsyan, Vazgen's younger brother and another prominent opposition figure.

The parliament attack is described as being among the darkest pages in Armenian history, which laid the foundation of the country's existing criminal and oligarchic system. Kocharian and Serzh Sargsyan are widely blamed for the killings, as many Armenians consider them the masterminds of the crime.